Imaging - Lab Three Muscles

ilium posterior to posterior gluteal line, dorsal surface of sacrum and coccyx, sacrotuberous ligament

Origin of the gluteus maximus

iliotibial tract that inserts into the lateral tibial condyle, some fibers insert on gluteal tuberosity

Insertion of the of the gluteus maximus

extends thigh, lateral rotation, extend hip relative to trunk or trunk relative to hip

Action of the of the gluteus maximus

inferior gluteal nerve

Nerve innervation of the gluteus maximus

external surface of the ilium between anterior and posterior gluteal lines

Origin of the gluteus medius

lateral surface of the greater trochanter of femur

Insertion of the gluteus medius

superior gluteal nerve

Nerve innervation of the gluteus medius

powerful abductor, medially rotate thigh, keep pelvis level when opposite leg is raised

Action of the gluteus medius

External surface of ilium between anterior and posterior gluteal lines

Origin of the gluteus minimus

anterior surface of greater trochanter of femur

Insertion of the gluteus minimus

powerful abductor, medially rotate thigh, keep pelvis level when opposite leg is raised

Action of the gluteus minimus

superior gluteal nerve

Nerve innervation of the gluteus minimus

anterior surface of sacrum; sacrotuberous ligament

Origin of the piriformis muscle

Superior border of greater trochanter of femur

Insertion of the piriformis muscle

branches of the anterior rami of S1 and S2

Nerve innervation of the piriformis muscle

laterally rotates extended thigh, abducts flexed thigh, steadies femoral head in acetabulum

Action of the piriformis muscle

pelvis surface of obturator membrane and surrounding bones

Origin of the obturator internus muscle

medial surface of greater trochanter of femur

Insertion of the obturator internus muscle

nerve to obturator internus

Nerve innervation of the obturator internus muscle

laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum

Action of the obturator internus muscle

margins of obturator foramen and obturator membrane

Origin of the obturator externus

trochanteric fossa of femur

Insertion of the obturator externus

obturator nerve (L3, L4)

Nerve innervation of the obturator externus

laterally rotates thigh, steadies head of femur in acetabulum

Action of the obturator externus

ischial spine

Origin of superior gemellus

medial surface of greater trochanter of femur

Insertion of superior gemellus

same nerve to supply as nerve to obturator internus

Nerve innervation of superior gemellus

laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum

Action of superior gemellus

ischial tuberosity

Origin of inferior gemellus

medial surface of greater trochanter of femur

Insertion of inferior gemellus

same nerve supply as quadratus femoris

Nerve innervation of inferior gemellus

laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum

Action of inferior gemellus

lateral border if ischial tuberosity

Origin of quadratus femoris

quadrate tubercle on intertrochanteric crest of femur and area inferior to it

Insertion of quadratus femoris

laterally rotates thigh, steadies femoral head in acetabulum

Action of quadratus femoris

nerve to quadratus femoris

Nerve innervation of quadratus femoris

medial half of inferior border of 12th ribs and tips of lumbar transverse processes

Origin of quadratus lumborum

iliolumbar ligament and internal lip of iliac crest

Insertion of quadratus lumborum

anterior branches of t12 and L1-L4 nerves

Nerve innervation of quadratus lumborum

extends and laterally flexes vertebral column; fixes 12th rib during inspiration

Action of quadratus lumborum

psoas major

iliacus

psoas minor

What muscles make up the iliopsoas?

slides fT12-L5 vertebrae and discs between them, transverse processes of all lumbar vertebrae

Origin of the psoas major

lesser trochanter of femur

Insertion of the psoas major

anterior rami of lumbar (L1, 2, 3)

Nerve innervation of the psoas major

act conjointly in flexing thigh at hip joint and in stabilizing

Action of the psoas major

iliac crest, iliac fossa, ala of sacrum and anterior sacroiliac ligament

Origin of iliacus

tendon of psoas major

Insertion of iliacus

femoral (L2, L3)

Nerve innervation of iliacus

flexes thigh and stabilizes hip joint; acts with psoas major

Action of iliacus

sides of T12-L1 vertebrae and intervertebral discs

Origin of psoas minor

pectineal line and ilipubic emincence via iliopetinal arch

Insertion of psoas minor

anterior rami of lumbar nerves

Nerve innervation of psoas minor

flexion of pelvis on lumbar spine, pelvic stabilizer

Action of psoas minor

superor ramus of pubis

Origin of pectineus

pectineal line of femur, just inferior to less trochanter

Insertion of pectineus

femoral nerve (L2, L3); may receive a branch from obturator nerve

Nerve innervation of pectineus

adducts and flexes the high; assists with medial rotation of thigh

Action of pectineus

body of pubis inferior to pubis crest

Origin of adductor longus

middle third of linea aspera of femur

Insertion of adductor longus

obturator nerve and branch of anterior division

Nerve innervation of adductor longus

adducts thigh

Action of adductor longus

body and inferior ramus of pubis

Origin of Gracilis

superior part of medial surface of tibia

Insertion of Gracilis

obturator nerve

Nerve innervation of Gracilis

adducts thigh; flexes leg; helps rotate leg medially

Action of Gracilis

body and inferior ramus of pubis

Origin of adductor brevis

pectineal line and proximal part of linea aspera of femur

Insertion of adductor brevis

obturator nerve and branch of anterior division

Nerve innervation of adductor brevis

adducts thigh, to some extent flexes it

Action of adductor brevis

adductor portion

hamstring portion

What parts make of the adductor magnus?

inferior ramus of pubis and ramus of ischium

Origin of adductor magnus adductor portion

gluteal tuberosity, linea aspera, and medial supracondylar line

Insertion of adductor magnus adductor portion

obturator nerve and branches of posterior division

Nerve innervation of adductor magnus adductor portion

adducts thigh, flexes thigh

Action of adductor magnus adductor portion

ischial tuberosity

Origin of adductor magnus hamstring portion

adductor tubercle of femur

Insertion of adductor magnus hamstring portion

tibial part of sciatic nerve (L4)

Nerve innervation of adductor magnus hamstring portion

adducts thigh, extends thigh

Action of adductor magnus hamstring portion